Cassells will be charged with supporting Bottle PR’s new business development programme and will lead a number of key client accounts.

Prior to Sony Pictures Television she was head of corporate affairs at O2 Ireland. She worked with Dublin-based agency, Drury Communications, and in Tokyo she worked in the international accounts division of Cosmo Public Relations.

Cassells said: 'As a vibrant, growing company with an exciting client base and a highly talented team of marketing and communications professionals, Bottle PR is one of the most forward-thinking and fast-moving PR firms around. I’m delighted to be joining the company at such an exciting stage in its ongoing success story.'

Claire Cairns, founder and director at Bottle PR, added: 'Cassells' impressive PR pedigree of brand experience, strategic insight and creativity will make a significant impact to the team. She brings with her a breadth of knowledge both nationally and globally and we look forward to the value she can bring to both our growing client list and the overall business.'